HP 72SR manual AutoBiDi Calibration is the automatic version of this, for details

Manual BiDi Registration Bidirectional registration is a method to align each of the print- heads so that dot placement is accurate in both directions along the X axis (along the direction of printhead travel).

The bidirectional registration pattern consists of a series of verti- cal lines. Half the pixels in this pattern are printed in one direc- tion, half of them in the other direction. When the pixels are accurately aligned, the pattern is clear. When the dots are not aligned, the pattern appears fuzzy and ill-defined.

Note	AutoBiDi Calibration is the automatic version of this
	calibration. Try AutoBiDi first before running this
	manual calibration (see “Auto Calibrations” on
	page 4-7 for details).

1.On the Manual Calibrations menu, press the ) key repeat- edly to highlight Manual BiDi Registration.

2.Press the  (Menu In) key to select the option.

3.Press ! (Proceed).

The control panel displays this prompt:

Print a manual bidi registration page?

4.Press ! (Proceed).

The printer prints the calibration pattern you selected.

5.When the calibration page has printed, the control panel dis- plays this prompt:

Bidi registration

Head 1: 0

6.Examine the BiDi Registration pattern for the current head, and determine which pattern is the closest to perfectly aligned.

Manual Calibrations 4-13